Split pulley



(N0 Model.) 2 Sheets-Sheet 1.

J. OLD.- SPLIT PULLEY.

No. 459,763. Patented Sept. 22, 18 91 (No Model.)

' J. OLD.

SPLIT PULLEY.

No. 459,763. Patented Sept, 22, 1891.

2 Sheets -Sheet' 2.

UNITED STATES .ATENT JAMES OLD, OF ALLEGHENY, PENNSYLVANIA.

SPLIT PULLEY.

SPECIFICATION forming part of Letters Patent No. 459,763, datedSeptember 22, 1891.

Application filed March 6, 1891. Serial No. 884,053. (No model.)

To all whom it may concern.-

Be it known that I, JAMES OLD, a resident of Allegheny city, in thecounty of Allegheny and State of Pennsylvania, have invented certain newand useful Improvements in Split Pulleys; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled ,in the art to which it pertains tomake and use the same.

The object of the invention relates to split pulleys for shafting andthe like and to means for securing them to shafts; and it conslsts inthe construction hereinafter described, and particularly pointed out inthe claims.

In the accompanying drawings, Figure 1 is an end View. Fig. 2 is asection on line a; a: of Fig. 1. Fig. 3 is a section of a modificationon a line corresponding to y y of Fig. 1. Fig. 4 is a detail. Fig. 5 isa central section of a second modification.

My improvement is applicable to pulleys made in diametric or radialsections. In the drawings, 1 l-indicate such sections at 12, suitablyformed for connection with a machine-shaft and recessed at the ends forthe reception of securingdevioes. These consist of the circular arcsorplates 2 2. One of these at each end of the pulley preferably hasoffsets 3 in its ends, which offsets overlap the ends of thecorresponding plate, the arcs being greater than a semicircle, when twoarcs or plates only are used at each end of the pulley. These plates areprovided near their extremities in the overlapping parts with oblongholes afor the entrance of wedgeshaped nuts or washers 5. These wedgesor wedge-like washers, which are oblong in cross-section, are providedwith central openings to receive screw-bolts 6,and one of each pair isinteriorly screw-threaded to engage the screw-threaded end of a bolt.The exterior ends of the oblong openings are by preference inwardlyinclined at about the angle of the wedges- These openings are of suchdimensions and so arranged that opposite sides of the wedges bear uponthe outer wall of said openings in the overlapping plates which overlap,whereby the latter are adapted to be forced in opposite directions by sotightening the screw-bolts as to draw the wedges toward each other. Thecurved plates .a nut or tube 9.

2 are secured to the pulley-sections in any suitable manner,as by bolts7 passing through suitable holes in both the plates and thepulley-sections. The relative sizes of the plates and sections are suchthat the latter only can bear on the shaft to which they are applied. Bythe means above described the rings formed by the two arcs at each endof the split pulley can be caused to contract and force thepulley-sections upon the shaft.

In Fig. 4 is shown a modification in which two wedges 5 5, attached to acommon head 8, are employed. This head may be adapted to fit indepressions formed by offsetting adjacent ends of curved plates. Eachoffset is provided with an opening at to receive a wedge. It will beunderstood that two oppositely-placed heads connected by a bolt to drawthem together and to render the wedges operative will be employed. Inthis form the plates 2 2, as represented, do not overlap. They are shownas drawn nearly as close to each other as the bolt will permit. Theoperation of the modified devices is similar to that of those firstabove described and the constructions are equivalent.

Many of the features of the device may be varied without changingsubstantially its principles of construction and operation. Thus theinvention is not limited to any particular material or number ofpulley-sections or number of arcs or plates, nor is it of the gist ofthe improvement that the plates are curved nor that both the sides ofparts 5 or 5' and the sides of the openings at are inclined, since ifeither is inclined to the other a wedgelike action will be produced.Neither is it essential how the plates are secured to thepulley-sections, nor that they be located in recesses in the same. Allsuch particulars can be varied by mechanical skill without departingfrom the invention.

In Fig. 3 are shown two bolts 6, having each a loose wedge,substantially such as above described, and having their ends screwedintoThus combined the two shaft-bolts can be used as one, and being suitablyplaced the wedges can be drawn together so as to bear upon the plates,as above described, by turning either end of the com pound bolt. Thisfigure is designed to indicate a metal pulley made in section andadapted to be secured upon a shaft by the means described.

In Fig. 5 is shown a modification suitable for large wooden pulleys. Inthis form interior plates 9 are provided with overlapping ends, part ofwhich by preference have offsets 3, and are employed to draw the woodenpart of the pulley upon the shaft by means of wedges, one of which 5 hasa screw-threaded opening to receive a fastening bolt or bolts. 'lhepulleys are transversely divided, as indicated at 11, to provide for theintroduction of the plates 2. 1O denotes a rim or flange formed,preferably, on the plates used with wooden pulleys and adapted to bedrawn into the wood by the action of the fasteningbolts to more securelyhold the wood and prevent its being split. These rims also will be foundparticularly useful for this purpose in the case of small pulleys, andin such I also contemplate the use of screws instead of the screw-bolts6 and Z.

The offsets above described, if employed, may be formed on both ends ofone of a pair thatare mated, or on one end of each of the pair, or onall the ends, as found convenient. The wedges, as shown, are made widerin one direction than the otherthat is, oblong in cross-sectionthoughWedges or nuts having the form of a frustum of a cone could be used withsimilar effect.

Having thus described my invention, what I desire to secure by LettersPatent is 1. In a split pulley, the combination of the pulley-sections,the plates provided with openings near their ends and secured to thesections, the wedges, and the bolts, the latter being adapted to forcethe wedges into the openings and force the plates toward each other,substantially as set forth.

In a split pulley, the combination of pulley-sections, with clampingdevices consisting of bolts and wedges applied to the ends of thesections, the bolts and wedges being parallel with the axis of thesections and adapted to force said sections tight to the shaft,substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribin g witnesses.

JAMES OLD.

Witnesses:

JAMES R. S'rnnmrr'r, HUGH S. 31mm.

